Synthesis of CeO 2 -Fe 2 O 3 Mixed Oxides for Low-Temperature Carbon Monoxide Oxidation

In this study, the CeO 2 -Fe 2 O 3 mixed oxide catalysts have been prepared by combustion method using gel-created tartaric acid. The ability of effective carbon monoxide (CO) oxidation to carbon dioxide (CO 2 ) by CeO 2 -Fe 2 O 3 catalyst under low-temperature conditions was also demonstrated. The calcined CeO 2 -Fe 2 O 3 material has a porous honeycomb structure and good gaseous absorption-desorption ability. The solid solution of CeO 2 -Fe 2 O 3 mixed oxides was formed by the substitution of Fe +3 ions at some Ce 4+ ion sites within the CeO 2 crystal lattice. The results also showed that the calcination temperature and the molar ratio of Ce 3+ ions to Fe 3+ ions (CF) affected the formation of the structural phase and the catalytic efficiency. The catalytic properties of the CeO 2 -Fe 2 O 3 mixed oxide were good at the CF ratio of 1 : 1, the average crystal size was near 70 nm, and the specific surface area was about 20.22 m 2 .g -1 . The full conversion of CO into CO 2 has been accomplished at a relatively low temperature of 270 °C under insufficient O 2 conditions.